The key technologies in dye-sensitized solar cell, including nanoporous TiO２2 film, dye-sensitizer, electrolyte, platinum catalysis, and TCO glass, have bee n investigated, and we also optimized the different technologies with assemblyin g the small area dye-sensitized solar cells. About 9% photo-electric conversion efficiency has been demostrated in our lab under AM1.5 solar simulator. Our results show that there would be a possibility for commercial production based on our technologies.